CONTENTS OF VOLUME XXVI 
NUMBER VI 
Two-PHASE CONVECTION IN IcGNEous MAcmaAs. Frank F. Grout 
PERMO-CARBONIFEROUS CONDITIONS VERSUS PERMO-CARBONIFEROUS 
Time. E. C. Case 
NOTES ON THE GEOLOGY OF EASTERN GUATEMALA AND NORTHWESTERN 
SPANISH HonpURAS. Sidney Powers . 
NOTES ON A COLLECTION OF ROCKS FROM HONDURAS, CENTRAL AMERICA. 
Wilbur G. Foye 
Lorss-DEPOSITING WINDS IN LoutsIANA. F. V. Emerson 
VoLUME CHANGES IN METAMORPHISM. Waldemar Lindgren 
DESCRIPTIONS OF SOME NEw SPECIES OF DEVONIAN FossiLs. Clinton 
R. Stauffer 
ON THE NATURE AND ORIGIN OF THE STYLOLITIC STRUCTURE IN TEN- 
NESSEE MARBLE. C.H. Gordon . 
THE VALLEY City GRABEN, UtaH. C. L. Dake 
REVIEWS 
RECENT PUBLICATIONS 
NUMBER VII 
Tue ECOLOGICAL SIGNIFICANCE OF THE EAGLE CREEK FLORA OF THE 
CotumBIA RIVER GorcE. Ralph W. Chaney 
On OOLITES AND SPHERULITES. Walter H. Bucher 
RHYTHMIC BANDING OF MANGANESE DIOXIDE IN RHYOLITE TUFF. 
W. A. Tarr 
THE RELATION OF THE Fort SCOTT FORMATION TO THE BOONE CHERT IN 
SOUTHEASTERN KANSAS AND NORTHEASTERN OKLAHOMA. Walter 
R. Berger 
A Form oF MULTIPLE Rock Diacrams. Frank F. Grout 
A Tyrer or IGNEOUS DIFFERENTIATION. Frank F. Grout 
Post-GLacIAL MOLLUSCA FROM THE Maris OF CENTRAL ILLINOIS. 
Frank Collins Baker 
RECENT PUBLICATIONS 
574 
576 
ond 
593 
610 
